1 example for logrotate

  # Logrotate Configuration Files:
#
#   - /usr/sbin/logrotate           The logrotate executable
#
#   - /etc/cron.daily/logrotate     This shell script executes the logrotate
#                                       command
#
#   - /etc/logrotate.conf           Log rotation configuration for all the log
#                                       files are specified in this file.
#
#   - /etc/logrotate.d              When individual packages are installed on
#                                       the system, they drop the log rotation
#                                       configuration information in this
#                                       directory

# Sample /etc/logrotate.conf that rotates a logfile for every 1KB.
#
/tmp/output.log {
    # runs only if the filesize is greater than or equal to this size
    size 1k

    # rotate the original file and create the new file with the specified
    # permission, user and group.
    create 700 bala bala

    # limits the number of log file rotation. So, this would keep only the
    # recent 4 rotated log files.
    rotate 4
 }

# To continue to write the log information in the newly created file AFTER
# rotating the old logfile, use this configuration:
/tmp/output.log {
         size 1k
         # create the copy of the original file and
         # truncates the original file to zero byte size
         copytruncate
         rotate 4
}

# Run the logrotate command, the -s option specifies the filename to write the
# logrotate status to:
logrotate -s /var/log/logstatus logrotate.conf

# Compress the rotated log files
/tmp/output.log {
        size 1k
        copytruncate
        create 700 bala bala
        rotate 4
        compress
}

# Logrotate dateext option: Rotate the old log file with date in the log filename
/tmp/output.log {
        size 1k
        copytruncate
        create 700 bala bala
        dateext
        rotate 4
        compress
}

# Rotate the log file weekly/daily/monthly
/tmp/output.log {
        monthly
        copytruncate
        rotate 4
        compress
}

# Run custom shell scripts immediately after log rotation
/tmp/output.log {
        size 1k
        copytruncate
        rotate 4
        compress
        postrotate
               /home/bala/myscript.sh
        endscript
}

#  indicates that the rotated log files would be removed after 100 days.
/tmp/output.log {
        size 1k
        copytruncate
        rotate 4
        compress
        maxage 100
        missingok
}

# default usage
logrotate /etc/logrotate.conf